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76 lines
2.6 KiB
Python
76 lines
2.6 KiB
Python
#!/usr/bin/env python
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#
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# A library that provides a Python interface to the Telegram Bot API
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# Copyright (C) 2015-2023
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# Leandro Toledo de Souza <devs@python-telegram-bot.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser Public License for more details.
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#
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# You should have received a copy of the GNU Lesser Public License
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# along with this program. If not, see [http://www.gnu.org/licenses/].
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"""This module contains helper functions related to enums.
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Warning:
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Contents of this module are intended to be used internally by the library and *not* by the
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user. Changes to this module are not considered breaking changes and may not be documented in
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the changelog.
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"""
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import enum as _enum # skipcq: PYL-R0201
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import sys
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from typing import Type, TypeVar, Union
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_A = TypeVar("_A")
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_B = TypeVar("_B")
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_Enum = TypeVar("_Enum", bound=_enum.Enum)
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def get_member(enum_cls: Type[_Enum], value: _A, default: _B) -> Union[_Enum, _A, _B]:
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"""Tries to call ``enum_cls(value)`` to convert the value into an enumeration member.
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If that fails, the ``default`` is returned.
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"""
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try:
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return enum_cls(value)
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except ValueError:
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return default
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# Python 3.11 and above has a different output for mixin classes for IntEnum, StrEnum and IntFlag
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# see https://docs.python.org/3.11/library/enum.html#notes. We want e.g. str(StrEnumTest.FOO) to
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# return "foo" instead of "StrEnumTest.FOO", which is not the case < py3.11
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class StringEnum(str, _enum.Enum):
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"""Helper class for string enums where ``str(member)`` prints the value, but ``repr(member)``
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gives ``EnumName.MEMBER_NAME``.
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"""
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__slots__ = ()
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def __repr__(self) -> str:
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return f"<{self.__class__.__name__}.{self.name}>"
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def __str__(self) -> str:
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return str.__str__(self)
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# Apply the __repr__ modification and __str__ fix to IntEnum
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class IntEnum(_enum.IntEnum):
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"""Helper class for int enums where ``str(member)`` prints the value, but ``repr(member)``
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gives ``EnumName.MEMBER_NAME``.
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"""
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__slots__ = ()
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def __repr__(self) -> str:
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return f"<{self.__class__.__name__}.{self.name}>"
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if sys.version_info < (3, 11):
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def __str__(self) -> str:
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return str(self.value)
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